If youre just wanting one where you leave it alone for thousands of hours: cookie clicker or any of the hundreds of idle games (remember that the steam deck and OLED monitors/TVs exist).
I recall as a kid leaving sonic adventure 2 on overnight and smash Bros melee to cook down the timer to unlock characters.
Do you know what you can leave on a static screen for hours and hours without damage?
An LCD screen.
Not to say that I do that, but many softwares and games have static UI and HUD elements, like healthbars and notifications.
Alright, now name a game where you’d have to do that for thousands or even hundreds of consecutive hours, especially on a portable console.
Warframe.
If youre just wanting one where you leave it alone for thousands of hours: cookie clicker or any of the hundreds of idle games (remember that the steam deck and OLED monitors/TVs exist).
I recall as a kid leaving sonic adventure 2 on overnight and smash Bros melee to cook down the timer to unlock characters.